When fishing a jig the first thing to think about is a crayfish...where do they like to hang out, what do they like to eat and pick at, what time of day are they most active on the water that you're fishing. This will produce a "time of day" so to speak. As the fellows have said, jigs can be fished anywhere for the most part...it's just about finding the right time and place as with all lures. I believe there are around 500 different species of crayfish in North America...google search "your state crayfish" and you should find some links as to the native species in your state which will help with color selection of your jig skirts. The color of a crayfish depends upon their diet and their molting stages...juveniles usually molt (shed their shell) about once a week and they shift colors while doing this. I live in the southeast where most of the crayfish around here are a rusty brown sort of color. That's not to say that I can't go out with a black and blue jig and catch em, but it's a starting point. Rip rap is a great place to fish a jig...fall down, and flipping docks are great places to start as well. A good rule of thumb with a jig is to pay attention to water temp...hotter = heavy weight & usually faster, colder = lighter weight and slower. Go on youtube.com and search for crayfish, watch how they move and swim.
A really good trailer for jigs are the NetBait Paca's...the size and kind of paca depends on the size of the jig, but all of them look really good on a jig. There are Paca Chunk's, Paca Craw's, Baby Paca Craw's...some are solid plastics and some are hollow and float up really nice on the end of your jig giving you a very good "defense stance". The "claws" give a good action moving through the water too!
Jig fishing can be very distressing at first...feeling a bite in strong winds can sometimes cause you to want to throw your fishing equipment in the water and the fish will bite in different ways as well, but it can be one of the most fun ways to catch largemouth in my opinion once you get the hang of it. There is nothing like casting a jig over some rip rap or a rock bed and moving it along when all of the sudden you feel that notable thump, set the hook and the 6 or 7lber on the other end tugs back.
Fishing a jig takes practice, practice, practice, and more practice...did I mention you need to practice? If you mostly fish out of a boat, you can find something elevated to stand on in the back yard and then tie on different size weights to pitch. I used to put metal coffee cans out about 15 feet or so, stand on a cinder block and try to pitch in it. This will help when fishing piers and fall down or bushes.
Good luck!!
